Roll d8:
1 - Zoobian Pleasure Barque - Storm-damaged and adrift, 1d4 winsome, green-haired maidens in silken veils cry out for succor. They claim to be brides to be on their way to the harem of a Zoobian potentate. They are actually harpies looking for a meal.
2 - Brazen Devil - With a screeching of rusty hinges, a brass gargoyle, corroded green and white, its wings festooned with seaweed, claws its way aboard. With determined spite--and mutterings of “Trifling jackanapes!” and “I’ll not be the butt of your japery. Not I!"-- it will stalk and kill everyone aboard, if it can.*
3 - Lovelorn Sea Serpent - The beast begins following in the ship’s wake, occasionally moving close enough to gently nuzzle the vessel’s stern suggestively. Its head and neck are above water at times, and its expression is comically lovestruck. It will place sea creature carcasses on the deck at night as tokens of affection.
4 - Iceberg - It drifts on the current. A frozen Viking longship and crew can be seen inside.
5 - Eight-Armed Bandit - An immense octopus demands to be giving all the gold aboard, hinting at some dire consequence if its demand is not satisfied.
6 - War Party - A double-hulled war canoe of the Gator Folk attacks. They wield spears and alligator-toothed war-clubs.
7 - Professorial Sea Cows - A pair of large and apparently quite learned Steller's sea cows can be heard conversing about metaphysics and the nature of the universe. Eavesdropping might well illicit useful information for magical research into spells related to other planes, but attempts to enter into the conversation or even requests to clarification or elucidation will lead them to either give disinformation out of spite or simply submerge (50% of either).**
8 - Strange Shipwreck Survivors - 3 former ship's crew, adrift on debris of their smashed vessel, cry out weakly for rescue. Each offers a different account of the destruction of their ship--and each tale is more terrifying and apocalyptic than the last. They wail and sob hysterically if question about these contradictions.**
*Inspired by a random table by GusL
**Based on suggestions by Jason Sholtis